Motor speed control system

专利名称：Motor speed control system发明人：Ryuichiro Iwai申请号：US06/164271申请日：19800630公开号：US04303874A公开日：19811201

摘要：Disclosed is a motor speed control system, in which a detected induced voltageof a motor under speed control is compared with a velocity reference signal which is asawtooth wave voltage synchronized with a power supply frequency. The motor speedcontrol system comprises a control circuit having a thyristor for controlling theenergization of the motor, a sawtooth wave generator circuit for generating thesawtooth wave voltage, an induced voltage detection circuit for detecting the inducedvoltage due to the rotation of the motor and storing the detected induced voltage in acapacitor, a limiter circuit for limiting a charge voltage of the capacitor, a comparatorcircuit for comparing the detection signal from the induced voltage detection circuit withthe sawtooth wave from the sawtooth wave generator circuit, and a pulse generatorcircuit for generating a trigger pulse for the thyristor. The motor speed control systemreduces the operation noise of the motor, reduces the variation of the motor speed andshortens the response time.

申请人：MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.

代理机构：Stevens, Davis, Miller & Mosher

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